There has been a great deal of going around the houses.
The original question (and the one that I believe I answered) was related to
the effect of trees.
Wood is a poor conductor. Even wet wood is a poor conductor. Even tree trunks
rising are poor conductors.
Poor conductors in the vicinity of an antenna have very little effect on its
and are likely to have a very minor effect on the pattern. So it's usually fine
to have an antenna
close to a tree.
Lots of any lossy material surrounding an antenna (at any distance) will
attenuate the signal
from that antenna. So it's not fine to have almost any antenna in a dense
jungle, and it's not
fine to have a UHF antenna firing through foliage. And so on and so forth....
See my original post which I think explained it better.
One final thought:
It has been proposed on a number of instances in the past that the
back-to-front ratio of a
Yagi could be improved by placing an 'absorber' element instead of, or as well
reflector. (That is an element deliberately made less conductive by, for
a resistor at its centre.) It doesn't work, and it's quite easy to prove that
it can't work.
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